Update README.md

Update Stage 1 model card with full content

Update README.md

Update README.md

Add Stage 1 model card README

Add Stage 1 training config

Add Stage 1 test evaluation metrics

Add Stage 1 training metrics

Add Stage 1 ONNX data file

Add Stage 1 FP32 ONNX model

Add Stage 1 INT8 ONNX model

Add Stage 1 best recall checkpoint

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